CN102922354A - Friction wheel traction transmission cycloidal processing device - Google Patents

Abstract

The invention discloses a friction wheel traction transmission cycloid processing device, which is composed of a first-stage sun gear, an input shaft, a first-stage planetary wheel, a first-stage planetary wheel bracket, a first-stage friction ring and a casing to form a first-stage planetary reduction mechanism; The secondary sun gear, secondary planetary gear, secondary planetary gear bracket, secondary friction ring and casing form the secondary planetary reduction mechanism; the secondary gear consists of driving wheel, drive wheel A, drive wheel B, driven wheel and intermediate shaft The friction wheel traction transmission mechanism; the output shaft is installed on the second-stage planetary wheel support; there is an eccentricity between the output shaft and the input shaft. When the present invention works, the two-stage friction wheel traction transmission planetary reduction mechanism converts the rotary motion of the input shaft into the rotary motion of the output shaft around the input shaft; the two-stage friction wheel traction transmission mechanism converts the input shaft The rotary motion is transmitted to the output shaft; the tool is mounted on the output shaft through the tool clamping device, thereby realizing the trochoidal machining movement of the tool.

Description

A friction wheel traction drive cycloid processing device

technical field

The invention relates to a friction traction transmission technology, in particular to a friction wheel traction transmission cycloid processing device.

Background technique

For slotting in traditional milling, milling cutters are generally used on milling machines for full-width machining. In the cutting process, full tool width machining has many unfavorable factors for the tool, such as cutting heat and chip discharge difficulties, and the tool is subject to a large cutting load. With the rapid development of high-speed cutting technology, in order to avoid full-width machining of tools, advanced CNC systems adopt cycloidal machining technology. Trochoidal machining moves along a specified path in a circular motion, gradually removing material from the blank, thereby avoiding full-width cuts of the tool. The tool path of cycloid machining is a smooth and continuous curve with the first derivative. During the cycloidal high-speed machining process, the tool is in dynamic all-round cutting, and the tool body is evenly stressed along the periphery, which reduces the cutting load of the tool and improves the stability of the load. The forward cutting of the material by the tool is also accompanied by the backward idling, so that the tool has sufficient time to cool down, and at the same time, it can automatically take away the chips, thereby greatly improving the cutting conditions and increasing the tool life. Cycloidal processing has great advantages for the processing of narrow grooves and cavities in high-hardness materials. However, the use of cycloidal processing technology requires that the coordinate axis of the CNC machine tool is constantly reciprocating, that is, the machine tool is in vibration, which is not conducive to the maintenance of the accuracy and life of the machine tool. Especially for large-scale gantry-type CNC milling machines, it is difficult to accomplish. Planetary electric grinding heads are generally used for high-precision grinding of inner holes on coordinate grinding machines. The workpiece is fixed on the worktable, and the grinding wheel not only rotates at high speed, but also performs planetary motion around the axis of the electric grinding head. However, the planetary electric grinding head is driven by two sets of power devices to drive the high-speed rotation of the grinding wheel and the planetary motion of the grinding wheel.

Contents of the invention

In order to solve the above-mentioned problems in the prior art, the present invention will design a friction wheel traction drive cycloid processing device that can maintain the accuracy and life of the machine tool and can not use two sets of power devices.

In order to achieve the above object, the technical solution of the present invention is as follows: a friction wheel traction drive cycloid processing device, comprising an input shaft, a primary sun gear, a primary planetary wheel, a casing, a primary planetary wheel bracket, a secondary planetary wheel, The secondary sun gear, the secondary planetary gear bracket, the driving wheel, the driven wheel, the primary friction ring, the secondary friction ring, the transmission wheel A, the intermediate shaft, the transmission wheel B and the output shaft, the primary sun gear is installed on On the input shaft, the first-stage planetary gear is in contact with the first-stage sun gear and installed on the first-stage planetary gear support, the first-stage friction ring is in contact with the first-stage planetary wheel and installed on the casing, and the first-stage The first-stage sun gear, the input shaft, the first-stage planetary gear, the first-stage planetary gear bracket, the first-stage friction ring and the housing form the first-stage planetary reduction mechanism; the second-stage sun gear is installed on the first-stage planetary reduction mechanism On the planetary gear bracket, the secondary planetary gear is in contact with the secondary sun gear and mounted on the secondary planetary gear bracket, the secondary friction ring is in contact with the secondary planetary gear and mounted on the housing, and the The secondary sun gear, the secondary planetary gear, the secondary planetary gear bracket, the secondary friction ring and the casing form the secondary planetary reduction mechanism; the driving wheel is installed on the other end of the input shaft, and the transmission wheel A 1. The transmission wheel B is installed on the intermediate shaft fixed on the secondary planetary wheel bracket of the second-stage planetary reduction mechanism, the driven wheel is installed on the output shaft, and the driving wheel, transmission wheel A, and transmission wheel B 1. The driven wheel and the intermediate shaft form a two-stage friction wheel traction transmission mechanism; the output shaft is installed on the two-stage planetary wheel support of the second-stage planetary reduction mechanism; there is an eccentricity between the output shaft and the input shaft.

There is one or more stages of planetary reduction mechanisms between the first-stage planetary reduction mechanism and the second-stage planetary reduction mechanism in the present invention, so as to change the rotation speed of the output shaft around the input shaft.

When the present invention works, the two-stage friction wheel traction transmission planetary reduction mechanism converts the rotary motion of the input shaft into the rotary motion of the output shaft around the input shaft; at the same time, the two-stage friction wheel traction transmission mechanism converts The rotary motion of the input shaft is transmitted to the output shaft; the tool is installed on the output shaft through the tool clamping device, so as to realize the cycloid machining movement of the tool.

Compared with the prior art, the present invention has the following beneficial effects:

1. Since the present invention adopts a multi-stage friction wheel traction transmission planetary reduction mechanism, the rotary motion of the input shaft is converted into the rotary motion of the output shaft around the input shaft, which avoids the continuous reciprocation of the coordinate axis of the CNC machine tool by the cycloid processing technology of the existing CNC system The requirement of movement is conducive to the maintenance of the precision and life of the machine tool, and at the same time solves the problem that the large-scale gantry-type CNC milling machine cannot perform cycloidal processing.

2. The present invention only requires one power input source, which avoids the requirement of two sets of power devices for the existing planetary electric grinding head.

3. Because the friction wheel traction drive used in the present invention transmits torque and power by the shearing force of the elastic fluid lubricating oil film (EHL) between two smooth metal rollers. Compared with other transmissions, such as gear transmission, traction transmission has the advantages of high mechanical efficiency, stable transmission, low noise, simple processing, and low manufacturing cost.

4. In addition to the above advantages, the present invention also has the advantages of compact structure, small size, light weight and long life, and can be applied to milling or grinding grooves and inner holes on milling machines or machining centers, especially large-scale gantry milling machines. Grooving.

Description of drawings

The present invention has only one accompanying drawing, wherein:

Fig. 1 is a schematic diagram of a friction wheel traction drive cycloid processing device with a two-stage planetary reduction mechanism.

In the figure: 1. Input shaft, 2. Primary sun gear, 3. Primary planetary gear, 4. Housing, 5. Primary planetary gear bracket, 6. Secondary planetary gear, 7. Secondary sun gear, 8. Secondary planetary wheel support, 9, driving wheel, 10, driven wheel, 11, primary friction ring, 12, secondary friction ring, 13, drive wheel A, 14, intermediate shaft, 15, drive wheel B, 16, output axis.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings. The friction wheel traction transmission cycloid processing device with two-stage planetary reduction mechanism is shown in Fig. 1. It consists of input shaft 1, output shaft 16, first-stage sun gear 2, first-stage planetary Primary friction ring 11, secondary sun gear 7, secondary planetary wheel 6, secondary planetary wheel bracket 8, secondary friction ring 12, driving wheel 9, driving wheel A13, driving wheel B15, driven wheel 10, intermediate shaft 14, Shell 4 etc. are formed. The first-stage friction wheel traction transmission planetary reduction mechanism is composed of the first-stage sun gear 2, the first-stage planetary wheel 3, the first-stage planetary wheel bracket 5, and the first-stage friction ring 11. The second-stage sun gear 7, the second-stage planetary wheel 6, The secondary friction wheel traction transmission planetary reduction mechanism formed by the secondary planetary wheel support 8 and the secondary friction ring 12. Input shaft 1 is connected to the machine tool spindle through a taper shank. The torque is input from the input shaft 1, and converted into the rotary motion of the output shaft 16 around the input shaft 1 through the first and second-stage friction wheel traction transmission planetary reduction mechanism. In order to prevent the overall size of the present invention from being too large, the diameters of the first-level planetary gear 3 and the second-level planetary gear 6, the first-level sun gear 2 and the second-level sun gear 7, the first-level inner friction ring 11 and the second-level inner friction ring 12 The difference is not big, the transmission ratio of the first-stage planetary reduction mechanism and the second-stage planetary reduction mechanism are close. In order to realize the cycloid movement track of the tool, the output shaft 16 is eccentric with the input shaft 1 at a certain distance. The torque transmitted from the spindle of the machine tool to the input shaft 1 through the taper shank connection is transmitted to the output shaft 16 through the secondary friction wheel transmission. The driving wheel 9 is installed on the input shaft 1, drives the intermediate shaft 14 through the transmission wheel A13 installed on the intermediate shaft 14, and then the driven wheel installed on the output shaft 16 of the device is driven by the transmission wheel B15 installed on the intermediate shaft 14 10, and finally transmit the input torque to the output shaft 16. The transmission ratio of the two-stage friction transmission mechanism is approximately 1:1. There is one or more planetary reduction mechanisms between the first-stage planetary reduction mechanism and the second-stage planetary reduction mechanism to change the rotation speed of the output shaft 16 around the input shaft 1 .

The friction traction transmission mechanism requires sufficient positive pressure between the friction wheels in contact with each other to form a high-pressure traction oil film and achieve sufficient traction transmission efficiency. The following two methods can provide sufficient positive pressure between the friction wheels: (1) Symmetrical planetary roller friction traction drives generally use tapered raceways, by adjusting the axial movement of the tapered raceways arranged face-to-face or back-to-back, to Radial displacement is generated to provide the positive pressure required for traction or friction transmission. The pressure automatic loading mechanism of planetary roller traction transmission adopts ball V-shaped groove or end face cam mechanism, and their working principles are basically the same. Among the present invention, the primary sun gear 2, the secondary sun gear 7, the driving wheel 9, and the driven wheel 10 are respectively composed of upper and lower parts and an intermediate washer. The upper and lower parts have a certain slope, adjusting the axial displacement between the two parts can control the radial direction between the primary sun gear 2 and the primary planetary gear 3, the secondary sun gear 7 and the secondary planetary gear 6 Displacement, and then adjust the amount of interference, so as to provide positive pressure for friction transmission. (2) The friction wheels at all levels use expansion sleeves, and the radial displacement of the friction wheel profile is controlled by adjusting the expansion screws of the expansion sleeves to achieve the effect of providing positive pressure. In the device of the present invention, the primary sun gear 2, the secondary sun gear 7, the driving wheel 9, the driven wheel 10, the driving wheel A13, the driving wheel B15, the primary planetary wheel 3 and the secondary planetary wheel 6 can all be installed outside it Tightening sleeve.

Claims (2)

1. A friction wheel traction drive cycloid processing device, characterized in that it includes an input shaft (1), a primary sun gear (2), a primary planetary wheel (3), a casing (4), and a primary planetary wheel bracket (5), secondary planetary gear (6), secondary sun gear (7), secondary planetary gear bracket (8), driving wheel (9), driven wheel (10), primary friction ring (11), secondary first-stage friction ring (12), transmission wheel A (13), intermediate shaft (14), transmission wheel B (15) and output shaft (16), and the first-stage sun gear (2) is installed on the input shaft (1) Above, the first-stage planetary gear (3) is in contact with the first-stage sun gear (2) and installed on the first-stage planetary gear bracket (5), and the first-stage friction ring (11) is in contact with the first-stage planetary gear ( 3) Contact and install on the casing (4), the first-stage sun gear (2), the input shaft (1), the first-stage planetary gear (3), the first-stage planetary gear bracket (5), and the first-stage friction ring (11) and the housing (4) form the first-stage planetary reduction mechanism; the second-stage sun gear (7) is installed on the first-stage planetary gear bracket (5) of the first-stage planetary reduction mechanism, and the second-stage The planetary gear (6) is in contact with the secondary sun gear (7) and mounted on the secondary planetary gear bracket (8), and the secondary friction ring (12) is in contact with the secondary planetary gear (6) and mounted on the casing (4), the secondary sun gear (7), secondary planetary gear (6), secondary planetary gear support (8), secondary friction ring (12) and casing (4) form the secondary planetary Speed reduction mechanism; the driving wheel (9) is installed on the other end of the input shaft (1), and the transmission wheel A (13) and transmission wheel B (15) are installed on the second-stage planetary reduction mechanism On the intermediate shaft (14) on the stage planetary wheel bracket (8), the driven wheel (10) is installed on the output shaft (16), the driving wheel (9), the transmission wheel A (13), the transmission Wheel B (15), driven wheel (10) and intermediate shaft (14) form a secondary friction wheel traction transmission mechanism; the output shaft (16) is installed on the secondary planetary wheel support (8 ); there is an eccentricity between the output shaft (16) and the input shaft (1). 2. A friction wheel traction drive cycloid processing device according to claim 1, characterized in that: there are one or more planetary reduction mechanisms between the first-stage planetary reduction mechanism and the second-stage planetary reduction mechanism , to change the rotation speed of the output shaft (16) around the input shaft (1).

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